Imaging lens and imaging apparatus including the imaging

ABSTRACT

An imaging lens substantially consists of, in order from an object side, five lenses of a first lens that has a positive refractive power and has a meniscus shape which is convex toward the object side, a second lens that has a biconcave shape, a third lens that has a meniscus shape which is convex toward an image side, a fourth lens that has a positive refractive power, and a fifth lens that has a negative refractive power and has at least one inflection point on an image side surface. Further, the imaging lens satisfies a predetermined conditional expression.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a fixed-focus imaging lens that formsan optical image of a subject on an imaging device, such as a chargecoupled device (CCD) and a complementary metal oxide semiconductor(CMOS), and to an imaging apparatus, such as a digital still camera, acellular phone with a camera, a mobile information terminal (PDA:Personal Digital Assistance), a smartphone, a tablet terminal, and amobile game machine, on which the imaging lens is mounted to performphotography.

2. Description of the Related Art

Recently, as personal computers have become popular in homes, digitalstill cameras which are capable of inputting image information aboutphotographed scenes, persons, and the like into the personal computershave spread rapidly. Further, a cellular phone, a smartphone, or atablet terminal in which a camera module for inputting images isinstalled has been increasing. Such apparatus having an imaging functionuses an imaging device, such as a CCD and a CMOS. Recently, because theimaging device has been miniaturized, there has been also a demand tominiaturize the whole of the imaging apparatus and an imaging lensmounted thereon. Further, since the number of pixels included in theimaging device has also been increasing, there has been a demand toenhance the resolution and performance of the imaging lens. For example,there has been a demand for performance corresponding to high resolutionof 5 megapixels or higher, and preferably performance corresponding tohigh resolution of 8 megapixels or higher.

To satisfy such demands, it can be considered that the imaging lens iscomposed of five or six lenses, which are a relatively large number oflenses. For example, U.S. Pat. No. 7,826,151 (Patent Document 1) andU.S. Pat. No. 8,369,029 (Patent Document 2) propose an imaging lenscomposed of five lenses. The imaging lens disclosed in Patent Documents1 and 2 substantially consists of, in order from an object side, fivelenses of a first lens that has a positive refractive power, a secondlens that has a negative refractive power, a third lens that has apositive refractive power, a fourth lens that has a positive refractivepower, and a fifth lens that has a negative refractive power.

SUMMARY OF THE INVENTION

In particular, in the imaging lenses used in apparatuses such as acellular phone, a smartphone or a tablet terminal, for which there hasbeen a demand to decrease the total length of the lens, there has been ademand to achieve a imaging lens capable of securing a wide angle ofview that is likely to satisfy the required specifications whiledecreasing the total length thereof. Hence, it is necessary to furtherincrease the angle of views of the imaging lenses disclosed in PatentDocuments 1 and 2.

The present invention has been made in view of the above-mentionedcircumstances and an object thereof is to provide an imaging lenscapable of securing a wide angle of view and achieving high imagingperformance in the range from the central angle of view to theperipheral angle of view while achieving a decrease in the total lengththereof. Another object of the present invention is to provide animaging apparatus capable of obtaining a photographed image with highresolution through the imaging lens which is mounted thereon.

The imaging lens of the present invention is an imaging lenssubstantially consisting of, in order from an object side, five lensesof:

a first lens that has a positive refractive power and has a meniscusshape which is convex toward the object side;

a second lens that has a biconcave shape;

a third lens that has a meniscus shape which is convex toward an imageside;

a fourth lens that has a positive refractive power; and

a fifth lens that has a negative refractive power and has at least oneinflection point on an image side surface,

in which the following conditional expression (1) is satisfied:−0.06<f1/f3<0.4  (1),where

f1 is a focal length of the first lens, and

f3 is a focal length of the third lens.

According to the imaging lens of the present invention, in the imaginglens which is composed of five lenses as a whole, a configuration ofeach lens element of the first to fifth lenses is optimized. Therefore,it is possible to achieve a lens system that has high resolutionperformance while decreasing the total length thereof.

In the imaging lens of the present invention, the expression“substantially consisting of five lenses” means that the imaging lens ofthe present invention may include not only the five lenses but also alens which has substantially no refractive power, optical elements, suchas a stop and a cover glass, which are not a lens, mechanism parts, suchas a lens flange, a lens barrel, an imaging device and a hand shake blurcorrection mechanism, and the like. When the lens includes an asphericsurface, the reference sign of the surface shape and refractive power ofthe lens is considered in a paraxial region.

In the imaging lens of the present invention, by employing andsatisfying the following desirable configuration, it is possible to makethe optical performance thereof better.

In the imaging lens of the present invention, the third lens may have apositive refractive power.

It is desirable that the imaging lens of the present invention furtherinclude an aperture stop that is disposed on the object side of anobject side surface of the second lens.

It is desirable that the imaging lens of the present invention satisfyany of the following conditional expressions (1-1) to (9). It should benoted that, as a desirable mode, any one of the conditional expressions(1) to (9) may be satisfied, or an arbitrary combination thereof may besatisfied:−0.055<f1/f3<0.3  (1-1),−0.65<f/f2<−0.2  (2),−0.64<f/f2<−0.25  (2-1),−0.2<(R3f−R3r)/(R3f+R3r)<0.2  (3),−0.16<(R3f−R3r)/(R3f+R3r)<0.15  (3-1),−1<f/f5<−0.3  (4),−0.8<f/f5<−0.35  (4-1),1<f·tan ω/R5r<10  (5),1.3<f·tan ω/R5r<3  (5-1),0.8<f/f1<1.6  (6),1<f/f1<1.5  (6-1),−0.3<f/f3<0.5  (7),−0.1<f/f3<0.4  (7-1),0<f/f34<0.7  (8),0<f/f34<0.6  (8-1), and0.05<D7/f<0.3  (9),where

f is a focal length of a whole system,

f1 is a focal length of the first lens,

f2 is a focal length of the second lens,

f3 is a focal length of the third lens,

f5 is a focal length of the fifth lens,

f12 is a composite focal length of the first lens and the second lens,

f34 is a composite focal length of the third lens and the fourth lens,

R3f is a paraxial radius of curvature of an object side surface of thethird lens,

R3 r is a paraxial radius of curvature of an image side surface of thethird lens,

R5r is a paraxial radius of curvature of an image side surface of thefifth lens,

ω is a half angle of view, and

D7 is a spacing on an optical axis between the third lens and the fourthlens.

The imaging apparatus of the present invention includes the imaging lensof the present invention.

According to the imaging lens of the present invention, in the imaginglens which is composed of five lenses as a whole, a configuration ofeach lens element is optimized, and particularly the shapes of the firstand fifth lenses are appropriately formed. Therefore, it is possible toachieve a lens system that is capable of securing a wide angle of viewand has high resolution performance in the range from the central angleof view to the peripheral angle of view while decreasing the totallength thereof.

Further, according to the imaging apparatus of the present invention,imaging signals based on an optical image formed by the imaging lens ofthe present invention, which has high imaging performance, are output.Therefore, it is possible to obtain a photographed image with highresolution.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a lens cross-sectional view illustrating a first configurationexample of an imaging lens according to an embodiment of the presentinvention and corresponding to Example 1;

FIG. 2 is a lens cross-sectional view illustrating a secondconfiguration example of an imaging lens according to an embodiment ofthe present invention and corresponding to Example 2;

FIG. 3 is a lens cross-sectional view illustrating a third configurationexample of an imaging lens according to an embodiment of the presentinvention and corresponding to Example 3;

FIG. 4 is a lens cross-sectional view illustrating a fourthconfiguration example of an imaging lens according to an embodiment ofthe present invention and corresponding to Example 4;

FIG. 5 is a lens cross-sectional view illustrating a fifth configurationexample of an imaging lens according to an embodiment of the presentinvention and corresponding to Example 5;

FIG. 6 is a lens cross-sectional view illustrating a sixth configurationexample of an imaging lens according to an embodiment of the presentinvention and corresponding to Example 6;

FIG. 7 is a lens cross-sectional view illustrating a seventhconfiguration example of an imaging lens according to an embodiment ofthe present invention and corresponding to Example 7;

FIG. 8 is a ray diagram of the imaging lens shown in FIG. 1;

FIG. 9 is an aberration diagram illustrating various aberrations of animaging lens according to Example 1 of the present invention, whereSection A shows a spherical aberration, Section B shows astigmatism(curvature of field), Section C shows distortion, and Section D shows alateral chromatic aberration;

FIG. 10 is an aberration diagram illustrating various aberrations of animaging lens according to Example 2 of the present invention, whereSection A shows a spherical aberration, Section B shows astigmatism(curvature of field), Section C shows distortion, and Section D shows alateral chromatic aberration;

FIG. 11 is an aberration diagram illustrating various aberrations of animaging lens according to Example 3 of the present invention, whereSection A shows a spherical aberration, Section B shows astigmatism(curvature of field), Section C shows distortion, and Section D shows alateral chromatic aberration;

FIG. 12 is an aberration diagram illustrating various aberrations of animaging lens according to Example 4 of the present invention, whereSection A shows a spherical aberration, Section B shows astigmatism(curvature of field), Section C shows distortion, and Section D shows alateral chromatic aberration;

FIG. 13 is an aberration diagram illustrating various aberrations of animaging lens according to Example 5 of the present invention, whereSection A shows a spherical aberration, Section B shows astigmatism(curvature of field), Section C shows distortion, and Section D shows alateral chromatic aberration;

FIG. 14 is an aberration diagram illustrating various aberrations of animaging lens according to Example 6 of the present invention, whereSection A shows a spherical aberration, Section B shows astigmatism(curvature of field), Section C shows distortion, and Section D shows alateral chromatic aberration;

FIG. 15 is an aberration diagram illustrating various aberrations of animaging lens according to Example 7 of the present invention, whereSection A shows a spherical aberration, Section B shows astigmatism(curvature of field), Section C shows distortion, and Section D shows alateral chromatic aberration;

FIG. 16 is a diagram illustrating an imaging apparatus which is acellular phone terminal including the imaging lens according to thepresent invention; and

FIG. 17 is a diagram illustrating an imaging apparatus which is asmartphone including the imaging lens according to the presentinvention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter, embodiments of the present invention will be described indetail with reference to the accompanying drawings.

FIG. 1 shows a first configuration example of an imaging lens accordingto a first embodiment of the present invention. The configurationexample corresponds to a lens configuration of a first numerical valueexample (Table 1 and Table 2) to be described later. Likewise, FIGS. 2to 7 show cross sections of second to seventh configuration examplescorresponding to the imaging lenses according to second to seventhembodiments to be described later. The second to seventh configurationexamples correspond to lens configurations of the second to seventhnumerical value examples (Tables 3 to 14) to be described later. InFIGS. 1 to 7, the reference sign Ri represents a radius of curvature ofi-th surface, where the number is the sequential number thatsequentially increases as it gets closer to an image side (an imagingside) when a surface of a lens element closest to an object side isregarded as a first surface. The reference sign Di represents an on-axissurface spacing between i-th surface and (i+1) th surface on an opticalaxis Z1. Since the respective configuration examples are basicallysimilar in configuration, the following description will be given on thebasis of the first configuration example of the imaging lens shown inFIG. 1, and the configuration examples shown in FIGS. 2 to 7 will bealso described as necessary. Further, FIG. 8 is an optical path diagramof the imaging lens L shown in FIG. 1, and shows an optical path of rays2 on the optical axis from an object point at the infinite distance andan optical path of rays 3 at the maximum angle of view.

An imaging lens L according to an embodiment of the present invention isappropriate to be used in various kinds of imaging apparatuses usingimaging devices such as a CCD and a CMOS. Especially, the imaging lens Lis appropriate to be used in relatively small-sized mobile terminalapparatus, for example, such as a digital still camera, a cellular phonewith a camera, a smartphone, a tablet terminal, and a PDA. This imaginglens L includes, along the optical axis Z1, a first lens L1, a secondlens L2, a third lens L3, a fourth lens L4, and a fifth lens L5 in thisorder from the object side.

FIG. 16 is a schematic diagram illustrating a cellular phone terminal,which is an imaging apparatus 1 according to an embodiment of thepresent invention. The imaging apparatus 1 according to the embodimentof the present invention includes imaging lens L according to thepresent embodiment and an imaging device 100 (refer to FIG. 1), such asa CCD, which outputs imaging signals based on an optical image formed bythe imaging lens L. The imaging device 100 is disposed at an imageformation surface (image plane R14) of the imaging lens L.

FIG. 17 is a schematic diagram illustrating a smartphone which is animaging apparatus 501 according to an embodiment of the presentinvention. The imaging apparatus 501 according to the embodiment of thepresent invention includes a camera unit 541 including the imaging lensL according to the present embodiment and the imaging device 100 (referto FIG. 1), such as a CCD, which outputs imaging signals based on anoptical image formed by the imaging lens L. The imaging device 100 isdisposed at the image formation surface (image plane R14) of the imaginglens L.

Various optical members CG may be disposed between the fifth lens L5 andthe imaging device 100 based on the configuration of a camera on whichthe imaging lens is mounted. For example, a flat-plate-shaped opticalmember, such as a cover glass for protecting an imaging surface and aninfrared-ray cut filter, may be disposed. In this case, for example, aflat-plate-shaped cover glass to which a coating having an effect of afilter, such as an infrared-ray cut filter and an ND filter, has beenapplied, or a material having the same effect may be used as the opticalmember CG.

Alternatively, an effect similar to the optical member CG may be givento the fifth lens L5 or the like by applying a coating to the fifth lensL5 or the like without using the optical member CG. Thereby, it ispossible to reduce the number of components, and to reduce the totallength.

Further, it is desirable that the imaging lens L includes an aperturestop St disposed on the object side of an object side surface of thesecond lens L2. Since the aperture stop St is disposed on the objectside of the object side surface of the second lens L2 in such a manner,especially in a peripheral portion of an imaging area, it is possible toprevent an angle of incidence of rays, which pass through the opticalsystem and are incident onto an imaging surface (imaging device), frombecoming large. In order to further enhance this effect, it is moredesirable that the aperture stop St be disposed on the object side of anobject side surface of the first lens L1. Here, the expression “disposedon the object side of the object side surface of the second lens L2”means that the position of the aperture stop in the optical axisdirection is the same as an intersection point between an on-axismarginal ray and the object side surface of the second lens L2 orlocated on the object side of the intersection point. Likewise, theexpression “disposed on the object side of an object side surface of thefirst lens L1” means that the position of the aperture stop in theoptical axis direction is the same as an intersection point between anon-axis marginal ray and the object side surface of the first lens L1 orlocated on the object side of the intersection point. In the embodimentsof the present invention, the imaging lenses of the first to sixthconfiguration examples (refer to FIGS. 1 to 6) are configurationexamples in which the aperture stop St is disposed on the object side ofthe object side surface of the first lens L1, and the imaging lens ofthe seventh configuration example (refer to FIG. 7) is a configurationexample in which the aperture stop St is disposed on the object side ofthe object side surface of the second lens L2. It should be noted thatthe aperture stop St shown herein does not necessarily represent thesize or shape thereof but shows the position thereof on the optical axisZ1.

Furthermore, when the aperture stop St is disposed on the object side ofthe object side surface of the first lens L1 in the optical axis, it isdesirable that the aperture stop St be disposed on the image side of avertex of the surface of the first lens L1. When the aperture stop St isdisposed on the image side of the vertex of the surface of the firstlens L1 in such a manner, it is possible to reduce the total length ofthe imaging lens including the aperture stop St. In the above-mentionedembodiments, the aperture stop St is disposed on the image side of thevertex of the surface of the first lens L1. However, the invention isnot limited to the embodiments, and the aperture stop St may be disposedon the object side of the vertex of the surface of the first lens L1.The arrangement, in which the aperture stop St is disposed on the objectside of the vertex of the surface of the first lens L1, is slightlydisadvantageous in terms of securing a peripheral light amount, comparedwith a case where the aperture stop St is disposed on the image side ofthe vertex of the surface of the first lens L1. However, the arrangementcan prevent an angle of incidence of rays, which pass through theoptical system and are incident onto the imaging surface (imagingdevice), from becoming large in the peripheral portion of the imagingarea in a more desirable manner.

As in the imaging lens according to the seventh embodiment shown in FIG.7, the aperture stop St may be disposed between the first lens L1 andthe second lens L2 in the optical axis direction. In this case, it ispossible to satisfactorily correct a curvature of field. When theaperture stop St is disposed between the first lens L1 and the secondlens L2 in the optical axis direction, as compared with a case where theaperture stop St is disposed on the object side of the object sidesurface of the first lens L1 in the optical axis direction, thisarrangement is disadvantageous in securing telecentricity, that is,making the principal rays parallel to such an extent that the principalrays are regarded as the optical axis (setting an incident angle thereofon the imaging surface such that the angle is approximate to zero).Thus, by applying an imaging device which is recently implemented as thedevelopment in the imaging device technology advances and in whichdeterioration in the light receiving efficiency and occurrence of colormixture due to increase of incident angle are more reduced than in theconventional imaging device, it is possible to achieve optimum opticalperformance.

In the imaging lens L, the first lens L1 has a positive refractive powerin the vicinity of the optical axis, and has a meniscus shape which isconvex toward the object side in the vicinity of the optical axis. Asshown in the embodiments, by making the first lens L1, which is a lensclosest to the object, have a positive refractive power and have ameniscus shape which is convex toward the object side in the vicinity ofthe optical axis, the position of the rear side principal point of thefirst lens L1 can be set to be close to the object, and thus it ispossible to appropriately reduce the total length.

The second lens L2 has a negative refractive power in the vicinity ofthe optical axis. As shown in the respective embodiments, the secondlens L2 has a biconcave shape in the vicinity of the optical axis.Hence, while satisfactorily correcting a chromatic aberration, it ispossible to suppress occurrence of a high-order spherical aberration.

The third lens L3 has a meniscus shape which is convex toward the imageside in the vicinity of the optical axis. Thereby, it is possible toappropriately reduce the total length. As long as the third lens L3 hasa meniscus shape which is convex toward the image side in the vicinityof the optical axis, it is possible to adopt a configuration in whichthe third lens L3 has a positive refractive power in the vicinity of theoptical axis, and it is also possible to adopt a configuration in whichthe third lens L3 has a negative refractive power in the vicinity of theoptical axis. When the third lens L3 is configured to have a positiverefractive power in the vicinity of the optical axis, it is possible tomore appropriately reduce the total length. Further, when the third lensL3 is configured to have a negative refractive power in the vicinity ofthe optical axis, it is possible to more satisfactorily correct achromatic aberration. The imaging lenses according to the first tofourth embodiments shown in FIGS. 1 to 4 are configuration examples inwhich the third lens L3 is configured to have a positive refractivepower in the vicinity of the optical axis, and the imaging lensesaccording to the fifth to seventh embodiments shown in FIGS. 5 to 7 areconfiguration examples in which the third lens L3 is configured to havea negative refractive power in the vicinity of the optical axis.

The fourth lens L4 has a positive refractive power in the vicinity ofthe optical axis. Thereby, especially at the medium angle of view, it ispossible to appropriately prevent the angle of incidence of rays, whichpass through the optical system and are incident onto the imageformation surface (imaging device), from becoming large. As shown in thefirst and fifth embodiments, it is desirable that the fourth lens L4have a meniscus shape which is convex toward the object side in thevicinity of the optical axis. In this case, it is possible tosatisfactorily correct astigmatism. As shown in the second, third, andsixth embodiments, the fourth lens L4 may have a biconvex shape in thevicinity of the optical axis. In this case, it is possible tosatisfactorily correct a spherical aberration. As shown in the fourthand seventh embodiments, the fourth lens L4 may have a meniscus shapewhich is convex toward the image side. In this case, it is possible toappropriately suppress occurrence of astigmatism.

The fifth lens L5 has a negative refractive power in the vicinity of theoptical axis. A lens, which has a negative refractive power in thevicinity of the optical axis, is disposed to be closest to the imageside of the imaging lens, and the imaging lens is configured, as awhole, to include, in order from the object side, a lens group having apositive refractive power and a lens group having a negative refractivepower. Thereby, it is possible to appropriately reduce the total length.The fifth lens L5 has a negative refractive power in the vicinity of theoptical axis, whereby it is possible to appropriately correct acurvature of field. When the fifth lens L5 is concave toward the imageside in the vicinity of the optical axis, it is possible to moreappropriately reduce the total length. In order to further enhance thiseffect, as shown in the first to seventh embodiments, it is desirablethat the fifth lens L5 have a meniscus shape which is concave toward theimage side in the vicinity of the optical axis.

The fifth lens L5 has at least one inflection point within an effectivediameter of the image side surface. The “inflection point” on the imageside surface of the fifth lens L5 is defined as a point at which theshape of the image side surface of the fifth lens L5 changes from aconvex shape to a concave shape (or from a concave shape to a convexshape) toward the image side. The inflection point can be disposed at anarbitrary position on the outside in a radial direction from the opticalaxis as long as the point is within the effective diameter of the imageside surface of the fifth lens L5. As shown in the first embodiment, byforming the image side surface of the fifth lens L5 in a shape in whichthe image side surface has at least one inflection point, especially ina peripheral portion of an image formation area, it is possible toprevent the angle of incidence of rays, which pass through the opticalsystem and are incident onto the image formation surface (imagingdevice), from becoming large.

According to the imaging lens L, in the imaging lens which is composedof five lenses as a whole, a configuration of each lens element of thefirst to fifth lenses L1 to L5 is optimized. Therefore, it is possibleto achieve a lens system that has high resolution performance whiledecreasing the total length thereof.

In the imaging lens L, in order to enhance the performance thereof, itis desirable that at least one surface of each lens of the first tofifth lenses L1 to L5 be formed as an aspheric surface.

Further, it is desirable that each of the lenses L1 to L5 constitutingthe imaging lens L be not formed as a cemented lens but a single lens.The reason is that, compared with a case where any of the lenses L1 toL5 is formed as a cemented lens, since the number of aspheric surfacesincreases, a degree of freedom in design of each lens is enhanced, andit is possible to appropriately achieve reduction in the total lengththereof.

Further, for example, as in the imaging lenses according to the first toseventh embodiments, when each lens configuration of the first to fifthlenses L1 to L5 of the imaging lens L is set such that the total angleof view is equal to or greater than 60 degrees, the imaging lens L canbe appropriately applied to a cellular phone terminal and the like whichare often used in a close-up shot.

Next, effects and advantages of the conditional expressions of theimaging lens L configured as described above will be described indetail. It should be noted that the imaging lens L satisfies thefollowing conditional expression (1). Further, among the followingconditional expressions, regarding conditional expressions excluding theconditional expression (1), it is desirable that the imaging lens Lsatisfy any one or an arbitrary combination of the conditionalexpressions. It is desirable that the conditional expressions to besatisfied be appropriately selected in accordance with factors necessaryfor the imaging lens L.

First, the focal length f3 of the third lens L3 and the focal length f1of the first lens L1 satisfy the following conditional expression (1).−0.06<f1/f3<0.4  (1)

The conditional expression (1) defines a desirable numerical range of aratio of the focal length f1 of the first lens L1 to the focal length f3of the third lens L3. When the third lens L3 has a negative refractivepower, by securing the refractive power of the third lens L3 relative tothe refractive power of the first lens L1 such that f1/f3 is greaterthan the lower limit of the conditional expression (1), the negativerefractive power of the third lens L3 does not become excessively strongrelative to the refractive power of the first lens L1. As a result, itis possible to appropriately reduce the total length. When the thirdlens L3 has a positive refractive power, by securing the refractivepower of the third lens L3 relative to the refractive power of the firstlens L1 such that f1/f3 is less than the upper limit of the conditionalexpression (1), the positive refractive power of the third lens L3 doesnot become excessively strong relative to the refractive power of thefirst lens L1. As a result, it is possible to satisfactorily correct aspherical aberration. In order to further enhance this effect, it isdesirable to satisfy the conditional expression (1-1), and it is moredesirable to satisfy the conditional expression (1-2).−0.055<f1/f3<0.3  (1-1)−0.05<f1/f3<0.2  (1-2)

Further, it is more desirable that the focal length f2 of the secondlens L2 and the focal length f of the whole system satisfy the followingconditional expression (2).−0.65<f/f2<−0.2  (2)

The conditional expression (2) defines a desirable numerical range of aratio of the focal length f of the whole system to the focal length f2of the second lens L2. By maintaining the refractive power of the secondlens L2 such that f/f2 is greater than the lower limit of theconditional expression (2), the refractive power of the second lens L2does not become excessively strong relative to the refractive power ofthe whole system, and thus it is possible to appropriately reduce thetotal length. By securing the refractive power of the second lens L2such that f/f2 is less than the upper limit of the conditionalexpression (2), the refractive power of the second lens L2 does notbecome excessively weak relative to the refractive power of the wholesystem, and thus it is possible to satisfactorily correct especially alongitudinal chromatic aberration. In order to further enhance thiseffect, it is more desirable to satisfy the conditional expression(2-1), and it is even more desirable to satisfy the conditionalexpression (2-2).−0.64<f/f2<−0.25  (2-1)−0.62<f/f2<−0.28  (2-2)

It is desirable that the paraxial radius of curvature R3f of the objectside surface of the third lens L3 and the paraxial radius of curvatureR3 r of the image side surface of the third lens L3 satisfy thefollowing conditional expression (3).−0.2<(R3f−R3r)/(R3f+R3r)<0.2  (3)

The conditional expression (3) defines each of a desirable numericalrange of the paraxial radius of curvature R3f of the object side surfaceof the third lens L3 and a desirable numerical range of the paraxialradius of curvature R3 r of the image side surface of the third lens L3.By setting the paraxial radius of curvature R3f of the object sidesurface of the third lens L3 and the paraxial radius of curvature R3 rof the image side surface of the third lens L3 such that (R3f−R3r)/(R3f+R3 r) is greater than the lower limit of the conditionalexpression (3), it is possible to appropriately reduce the total length.By setting the paraxial radius of curvature R3f of the object sidesurface of the third lens L3 and the paraxial radius of curvature R3 rof the image side surface of the third lens L3 such that (R3f−R3r)/(R3f+R3 r) is less than the upper limit of the conditional expression(3), it is possible to satisfactorily correct a spherical aberration. Inorder to further enhance this effect, it is more desirable to satisfythe following conditional expression (3-1), and it is even moredesirable to satisfy the conditional expression (3-2).−0.16<(R3f−R3r)/(R3f+R3r)<0.15  (3-1)−0.12<(R3f−R3r)/(R3f+R3r)<0.12  (3-2)

Further, it is desirable that the focal length f5 of the fifth lens L5and the focal length f of the whole system satisfy the followingconditional expression (4).−1<f/f5<−0.3  (4)

The conditional expression (4) defines a desirable numerical range of aratio of the focal length f of the whole system to the focal length f5of the fifth lens L5. By maintaining the refractive power of the fifthlens L5 such that f/f5 is greater than the lower limit of theconditional expression (4), the refractive power of the fifth lens L5does not become excessively strong relative to the positive refractivepower of the whole system, and thus, especially at the medium angle ofview, it is possible to prevent the angle of incidence of rays, whichpass through the optical system and are incident onto the imageformation surface (imaging device), from becoming large. By securing therefractive power of the fifth lens L5 such that f/f5 is less than theupper limit of the conditional expression (4), the refractive power ofthe fifth lens L5 does not become excessively weak relative to therefractive power of the whole system, and thus it is possible toappropriately reduce the total length while satisfactorily correcting acurvature of field. In order to further enhance this effect, it is moredesirable to satisfy the conditional expression (4-1), and it is evenmore desirable to satisfy the conditional expression (4-2).−0.8<f/f5<−0.35  (4-1)−0.6<f/f5<−0.4  (4-2)

Further, it is desirable that the focal length f of the whole system,the half angle of view ω, and the paraxial radius of curvature R5r ofthe image side surface of the fifth lens L5 satisfy the followingconditional expression (5).1<f·tan ω/R5r<10  (5)

The conditional expression (5) defines a desirable numerical range of aratio of the paraxial image height (f·tan ω) to the paraxial radius ofcurvature R5r of the image side surface of the fifth lens L5. By settingthe paraxial image height (f·tan ω) relative to the paraxial radius ofcurvature R5r of the image side surface of the fifth lens L5 such thatf·tan ω/R5r is greater than the lower limit of the conditionalexpression (5), an absolute value of the paraxial radius of curvatureR5r of the image side surface of the fifth lens L5, which is a surfaceof the imaging lens closest to the image side, does not becomeexcessively large relative to the paraxial image height (f·tan ω), andthus, it is possible to sufficiently correct a curvature of field whilereducing the total length. Further, by setting the paraxial image height(f·tan ω) relative to the paraxial radius of curvature R5r of the imageside surface of the fifth lens L5 such that f·tan ω/R5r is less than theupper limit of the conditional expression (5), the absolute value of theparaxial radius of curvature R5r of the image side surface of the fifthlens L5, which is a surface of the imaging lens closest to the imageside, does not become excessively small relative to the paraxial imageheight (f·tan ω), and thus, especially at the medium angle of view, itis possible to prevent the angle of incidence of rays, which passthrough the optical system and are incident onto the image formationsurface (imaging device), from becoming large. In order to furtherenhance this effect, it is desirable to satisfy the conditionalexpression (5-1)1.3<f·tan ω/R5r<3  (5-1)

Further, it is desirable that the focal length f1 of the first lens L1and the focal length f of the whole system satisfy the followingconditional expression (6).0.8<f/f1<1.6  (6)

The conditional expression (6) defines a desirable numerical range of aratio of the focal length f of the whole system to the focal length f1of the first lens L1. By securing the refractive power of the first lensL1 such that f/f1 is greater than the lower limit of the conditionalexpression (6), the positive refractive power of the first lens L1 doesnot become excessively weak relative to the refractive power of thewhole system, and thus it is possible to appropriately reduce the totallength. By maintaining the refractive power of the first lens L1 suchthat f/f1 is less than the upper limit of the conditional expression(6), the positive refractive power of the first lens L1 does not becomeexcessively strong relative to the refractive power of the whole system,and thus it is possible to satisfactorily correct especially a sphericalaberration. In order to further enhance this effect, it is moredesirable to satisfy the conditional expression (6-1), and it is evenmore desirable to satisfy the conditional expression (6-2),1<f/f1<1.5  (6-1)1.25<f/f1<1.4  (6-2)

Further, it is desirable that the focal length f3 of the third lens L3and the focal length f of the whole system satisfy the followingconditional expression (7).−0.3<f/f3<0.5  (7)

The conditional expression (7) defines a desirable numerical range of aratio of the focal length f of the whole system to the focal length f3of the third lens L3. When the third lens L3 has a negative refractivepower in the vicinity of the optical axis, by maintaining the refractivepower of the third lens L3 such that f/f3 is greater than the lowerlimit of the conditional expression (7), the negative refractive powerof the third lens L3 does not become excessively strong relative to therefractive power of the whole system, and thus it is possible toappropriately reduce the total length. When the third lens L3 has apositive refractive power in the vicinity of the optical axis, bymaintaining the refractive power of the third lens L3 such that f/f3 isless than the upper limit of the conditional expression (7), thepositive refractive power of the third lens L3 does not becomeexcessively strong relative to the refractive power of the whole system,and thus it is possible to satisfactorily correct a sphericalaberration. In order to further enhance this effect, it is moredesirable to satisfy the conditional expression (7-1), and it is evenmore desirable to satisfy the conditional expression (7-2).−0.1<f/f3<0.4  (7-1)−0.08<f/f3<0.3  (7-2)

It is desirable that the composite focal length f34 of the third lens L3and the fourth lens L4 and the focal length f of the whole systemsatisfy the following conditional expression (8).0<f/f34<0.7  (8)

The conditional expression (8) defines a desirable numerical range of aratio of the focal length f of the whole system to the composite focallength f34 of the third lens L3 and the fourth lens L4. By securing thecomposite focal length f34 of the third lens L3 and the fourth lens L4such that f/f34 is greater than the lower limit of the conditionalexpression (8), the refractive power of the lens group composed of thethird lens L3 and the fourth lens L4 does not become excessively weakrelative to the refractive power of the whole system. As a result,especially at the medium angle of view, it is possible to prevent theangle of incidence of rays, which pass through the optical system andare incident onto the image formation surface (imaging device), frombecoming large while reducing the total length. By maintaining thecomposite focal length f34 of the third lens L3 and the fourth lens L4such that f/f34 is less than the upper limit of the conditionalexpression (8), the refractive power of the lens group composed of thethird lens L3 and the fourth lens L4 does not become excessively strongrelative to the refractive power of the whole system, and thus it ispossible to satisfactorily correct a spherical aberration. In order tofurther enhance this effect, it is desirable to satisfy the conditionalexpression (8-1), and it is more desirable to satisfy the conditionalexpression (8-2).0<f/f34<0.6  (8-1)0.05<f/f34<0.5  (8-2)

Further, it is desirable that the spacing D7 on the optical axis betweenthe third lens L3 and the fourth lens L4 and the focal length f of thewhole system satisfy the following conditional expression (9).0.05<D7/f<0.3  (9)

The conditional expression (9) defines a desirable numerical range of aratio of the spacing D7 on the optical axis between the third lens L3and the fourth lens L4 to the focal length f of the whole system. Bysecuring the spacing D7 on the optical axis between the third lens L3and the fourth lens L4 relative to the focal length f of the wholesystem such that D7/f is greater than the lower limit of the conditionalexpression (9), it is possible to appropriately suppress distortionwhich tends to occur when the total length is reduced. By maintainingthe spacing D7 on the optical axis between the third lens L3 and thefourth lens L4 relative to the focal length f of the whole system suchthat D7/f is less than the upper limit of the conditional expression(9), it is possible to satisfactorily correct astigmatism. In order tofurther enhance this effect, it is desirable to satisfy the conditionalexpression (9-1), and it is even more desirable to satisfy theconditional expression (9-2).0.07<D7/f<0.2  (9-1)0.08<D7/f<0.15  (9-2)

Next, referring to FIGS. 2 to 7, imaging lenses according to second toseventh embodiments of the present invention will be described indetail. In the imaging lenses according to the first to seventhembodiments shown in FIGS. 1 to 7, all surfaces of the first to fifthlenses L1 to L5 are formed to be aspheric. As in the first embodiment,the imaging lenses according to the second to seventh embodiments of thepresent invention substantially consist of, in order from the objectside, five lenses of: the first lens L1 that has a positive refractivepower and has a meniscus shape which is convex toward the object side;the second lens L2 that has a biconcave shape; the third lens L3 thathas a meniscus shape which is convex toward the image side; the fourthlens L4 that has a positive refractive power; and the fifth lens L5 thathas a negative refractive power and has at least one inflection point onan image side surface. Hence, in the following first to seventhembodiments, only the different specific configurations of the lensesconstituting the respective lens groups will be described. Since theconfigurations which are common among the first to seventh embodimentsrespectively have the same effects, configurations and effects thereofwill be described in order of the sequence numbers of the embodiments,and the configurations and effects common to the other embodiments willnot be repeatedly described but will be omitted.

As in the second and third embodiments shown in FIGS. 2 and 3, thefourth lens L4 may have a biconvex shape in the vicinity of the opticalaxis. When the fourth lens L4 has a biconvex shape in the vicinity ofthe optical axis, it is possible to satisfactorily correct a sphericalaberration. In the second and third embodiments, the lens configurationsof the first to third lenses L1 to L3 and fifth lens L5 are common tothe first embodiment. Therefore, according to the respective lensconfigurations, it is possible to obtain the same effects as therespective corresponding configurations of the first embodiment.

As in the fourth embodiment shown in FIG. 4, the fourth lens L4 may havea meniscus shape which is convex toward the image side in the vicinityof the optical axis. In this case, it is possible to appropriatelysuppress occurrence of astigmatism. Further, in the fourth embodiment,the lens configurations of the first to third lenses L1 to L3 and fifthlens L5 are common to the first embodiment. Therefore, according to therespective lens configurations, it is possible to obtain the sameeffects as the respective corresponding configurations of the firstembodiment.

As in the fifth embodiment shown in FIG. 5, the third lens L3 isconfigured to have a negative refractive power in the vicinity of theoptical axis, and the configurations of the first to fifth lenses L1 toL5 may be common to the respective corresponding configurations of thefirst embodiment except that the third lens L3 has a negative refractivepower in the vicinity of the optical axis. By making the third lens L3have a negative refractive power in the vicinity of the optical axis, itis possible to satisfactorily correct a chromatic aberration. In thefifth embodiment, according to the respective configurations of thefirst to fifth lenses L1 to L5 common to the first embodiment, it ispossible to obtain the same effects as the respective correspondingconfigurations of the first embodiment.

As in the sixth embodiment shown in FIG. 6, the third lens L3 isconfigured to have a negative refractive power in the vicinity of theoptical axis, and the configurations of the first to fifth lenses L1 toL5 may be common to the respective corresponding configurations of thesecond embodiment except that the third lens L3 has a negativerefractive power in the vicinity of the optical axis. By making thethird lens L3 have a negative refractive power in the vicinity of theoptical axis, similarly to the above, it is possible to satisfactorilycorrect a chromatic aberration. In the sixth embodiment, according tothe respective configurations of the first to fifth lenses L1 to L5common to the second embodiment, it is possible to obtain the sameeffects as the respective corresponding configurations of the secondembodiment.

As in the seventh embodiment shown in FIG. 7, the fourth lens L4 mayhave a meniscus shape which is convex toward the image side in thevicinity of the optical axis in a similar manner to the fourthembodiment, and the first to third lenses L1 to L3 and the fifth lens L5may have the same lens configurations as the lenses of the fifthembodiment. According to the respective lens configurations, it ispossible to obtain the same effects as the respective correspondingconfigurations of the fourth and fifth embodiments.

As described above, according to the imaging lens of the embodiment ofthe present invention, in the imaging lens which is composed of fivelenses as a whole, the configurations of the respective lens elementsare optimized. Therefore, it is possible to secure a wide angle of viewthat is likely to satisfy the required specifications while reducing thetotal length, and it is possible to achieve a lens system having highresolution performance.

By satisfying appropriately desirable conditions, it is possible toachieve higher imaging performance. Furthermore, according to theimaging apparatus of the embodiment, imaging signals based on an opticalimage, which is formed by the high-performance imaging lens according tothe embodiment, are output. Therefore, it is possible to obtain aphotographed image with high resolution in the range from the centralangle of view to the peripheral angle of view.

Next, specific numerical examples of the imaging lens according to theembodiment of the present invention will be described. Hereinafter, aplurality of numerical examples will be described collectively.

Table 1 and Table 2, which will be given later, show specific lens datacorresponding to the configuration of the imaging lens shown in FIG. 1.Specifically, Table 1 shows basic lens data, and Table 2 shows data onaspheric surfaces. In the lens data shown in Table 1, the column ofsurface number Si shows the surface number of the i-th surface in theimaging lens of Example 1. The surface of the lens element closest tothe object side is the first surface (the aperture stop St is thefirst), and surface numbers sequentially increase toward the image side.The column of the radius of curvature Ri shows values (mm) of the radiusof curvature of i-th surface from the object side to correspond to thereference sign Ri in FIG. 1. Likewise, the column of the on-axis surfacespacing Di shows spaces (mm) on the optical axis between the i-thsurface Si and the (i+1)th surface Si+1 on the optical axis from theobject side. The column of Ndj shows values of the refractive index ofthe j-th optical element from the object side for the d-line (587.56nm). The column of vdj shows values of the Abbe number of the j-thoptical element from the object side for the d-line. It should be notedthat, in each piece of lens data, as various data items, values of thefocal length f of the whole system (mm), the back focal length Bf (mm),and the total lens length TL (mm) are respectively shown. In addition,the back focal length Bf indicates an air-converted value, and likewise,in the total lens length TL, the back focal length portion uses anair-converted value.

In the imaging lens according to Example 1, both surfaces of each of thefirst to fifth lenses L1 to L5 are aspheric. In the basic lens datashown in Table 1, the radii of curvature of these aspheric surfaces arerepresented as numerical values of the radius of curvature near theoptical axis (paraxial radius of curvature).

Table 2 shows aspheric surface data in the imaging lens system accordingto Example 1. In the numerical values represented as the asphericsurface data, the reference sign “E” means that a numerical valuefollowing this is a “exponent” having a base of 10 and that thisnumerical value having a base of 10 and expressed by an exponentialfunction is multiplied by a numerical value before the “E”. For example,this means that “1.0E-02” is “1.0×10⁻²”.

As aspheric surface data, values of coefficients Ai and KA in theaspheric surface expression represented by the following expression (A)are shown. Specifically, Z represents the length (mm) of a perpendicularfrom a point on an aspheric surface at height h from an optical axis toa plane that contacts with the vertex of the aspheric surface (the planeperpendicular to the optical axis).Z=C·h ²/{1+(1−KA·C ² ·h ²)^(1/2) }+ΣAi·h ^(i)  (A)

Here,

Z is a depth of the aspheric surface (mm),

h is a distance (height) from the optical axis to the lens surface (mm),

C is a paraxial curvature=1/R

(R: a paraxial radius of curvature),

Ai is an i-th order aspheric surface coefficient (i is an integer equalto or greater than 3), and

KA is an aspheric surface coefficient.

As in the imaging lens according to the above-mentioned Example 1,Tables 3 to 14 show specific lens data as Examples 2 to 7, correspondingto the configuration of the imaging lenses shown in FIGS. 2 to 7. In theimaging lenses according to Examples 1 to 7, both surfaces of each ofthe first to fifth lenses L1 to L5 are aspheric.

FIG. 9, Section A to Section D show a spherical aberration, astigmatism(curvature of field), distortion (a distortion aberration), and alateral chromatic aberration (a chromatic aberration of magnification)in the imaging lens of Example 1, respectively. Each aberration diagramillustrating a spherical aberration, astigmatism (curvature of field),and distortion (a distortion aberration) shows an aberration for thed-line (a wavelength of 587.56 nm) as a reference wavelength. Thediagram of a spherical aberration diagram and the diagram of a lateralchromatic aberration diagram show also aberrations for the F-line (awavelength of 486.1 nm) and the C-line (a wavelength of 656.27 nm). Thediagram of a spherical aberration also shows an aberration for theg-line (a wavelength of 435.83 nm). In the diagram of astigmatism, thesolid line indicates an aberration in the sagittal direction (S), andthe broken line indicates an aberration in the tangential direction (T).Fno. indicates an F-number, and ω indicates a half angle of view.

Likewise, FIG. 10, Section A to D to FIG. 15, Section A to D showvarious aberrations of the imaging lenses of Examples 2 to 7.

Table 15 collectively shows values of the conditional expressions (1)and (9) of Examples 1 to 7 according to the present invention.

As can be seen from the above-mentioned numerical value data andaberration diagrams, in each example, high imaging performance isachieved while the total length is reduced.

The imaging lens of the present invention is not limited to theabove-mentioned embodiments and examples, and may be modified to variousforms. For example, the values of the radius of curvature, the on-axissurface spacing, the refractive index, the Abbe number, the asphericsurface coefficient, and the like of the lens elements are not limitedto the values shown in the numerical examples, and may have differentvalues.

Further, in the description of each of all the examples, it is a premisethat the imaging lens is used with fixed focus, but it may be possibleto adopt a configuration in which focus is adjustable. For example, theimaging lens may be configured in such a manner that autofocusing ispossible by extending the whole lens system or by moving some lenses onthe optical axis.

TABLE 1 EXAMPLE 1 f = 4.437, Bf = 1.052, TL = 4.970 Si Ri Di Ndj νdj1(APERTURE ∞ −0.149 STOP) *2 1.56470 0.605 1.53410 55.80 *3 25.589630.188 *4 −7.97373 0.349 1.63370 24.10 *5 14.39310 0.289 *6 −5.851900.477 1.53372 55.82 *7 −5.96826 0.522 *8 20.29247 0.349 1.63164 21.50 *970.20130 0.201 *10 3.33525 0.938 1.53390 55.95 *11 1.70055 0.487 12 ∞0.145 1.51633 64.14 13 ∞ 0.469 14 ∞ *ASPHERIC SURFACE

TABLE 2 EXAMPLE 1 - ASPHERIC SURFACE DATA SURFACE NUMBER KA A3 A4 A5 A62 −2.0107673E+01 −2.5122245E−02 9.5447229E−01 −1.5269939E+001.2333194E+00 3 −4.4721655E+01 −7.5098320E−03 1.3734328E−02−1.2620308E−01 −5.2879412E−02  4 −9.0798027E+00  2.2518114E−03−2.0714586E−02   4.2596813E−01 −1.5871943E+00  5 −8.1586614E+01−5.2871529E−03 1.3688672E−01 −1.2122365E−01 −5.8734494E−01  6−2.3352074E+01 −1.0120296E−02 3.6676484E−01 −5.0508509E+00 2.7487822E+017 −7.8920389E+00  7.5906269E−02 −3.9354370E−01   5.1636800E−01−3.9271499E−02  8 −9.2483318E+00  1.1749777E−01 −2.7918757E−01  1.0260086E+00 −1.6782820E+00  9 −1.8083981E+00  1.0908916E−017.9730373E−02 −5.0981988E−01 1.1863918E+00 10 −7.4953884E+00 8.5089140E−02 −2.8537321E−01  −5.4632802E−02 2.4818599E−01 11−5.5804315E+00  9.4920401E−02 −5.2706800E−01   1.0207983E+00−1.2910390E+00  A7 A8 A9 A10 A11 2 −9.0760960E−01 −3.2599369E+002.1151285E+01 −4.7597929E+01 4.8683302E+01 3 −1.2180794E+00 1.4609061E+01 −5.3701974E+01   9.1501980E+01 −6.7816095E+01  4 2.7928618E+00 −8.4619610E−01 −4.9236281E+00   4.8157171E+006.2469486E+00 5  2.4549478E+00 −1.5499826E−02 −1.1089142E+01  1.3837048E+01 4.2469366E+00 6 −9.4161572E+01  2.1752382E+02−3.5552128E+02   4.1375344E+02 −3.0933652E+02  7 −1.1937346E+00 6.0574922E−01 2.2254305E+00 −2.8347862E+00 4.5807226E−01 8 9.8511945E−01 −3.2037821E−01 1.0204325E+00 −1.6468881E+00 9.0056952E−019 −1.7252023E+00  1.2255519E+00 −1.8985872E−01  −3.0509267E−012.2620597E−01 10 −1.1465911E−01 −5.3916987E−02 6.4130273E−02−5.4816243E−03 −7.6815670E−03  11  1.0202051E+00 −5.0150247E−011.6428601E−01 −4.5721690E−02 9.7334611E−03 A12 A13 A14 A15 A16 2 1.3769743E+00 −6.6746006E+01 7.7042632E+01 −3.4451827E+01 4.0689063E+003  4.6667795E+00  5.9934362E+00 2.2078005E+01 −1.8811998E+012.6210841E+00 4 −9.4028975E+00 −2.4036376E+00 2.7140644E+00 8.1805228E+00 −6.0533178E+00  5 −9.2385438E+00 −1.2469257E+011.6079585E+01  1.0196222E+00 −4.1195227E+00  6  7.7818002E+01 9.6725661E+01 −9.4918975E+01   2.2435397E+01 2.7748652E+00 7 7.6689640E−01 −3.4553498E−01 1.9906269E−01 −2.0245888E−01 6.0094187E−028  8.1844527E−02 −2.5792662E−01 6.2387834E−02  1.4556969E−02−5.6413622E−03  9 −7.2789331E−02  1.6397577E−02 −3.6006570E−03  3.6343818E−04 3.3160097E−05 10  4.1829911E−04 −4.9028600E−041.2502828E−03 −4.8583000E−04 5.6463952E−05 11  3.3533546E−03−4.1060693E−03 1.5198832E−03 −2.5849639E−04 1.7105011E−05

TABLE 3 EXAMPLE 2 f = 4.105, Bf = 1.101, TL = 4.818 Si Ri Di Ndj νdj1(APERTURE ∞ −0.182 STOP) *2 1.56283 0.505 1.53391 55.89 *3 9.119160.192 *4 −17.71633 0.358 1.63351 23.63 *5 16.27709 0.283 *6 −4.307400.488 1.53391 55.89 *7 −3.94425 0.437 *8 14.16438 0.362 1.63351 23.63 *9−15.87103 0.180 *10 6.08693 0.912 1.53391 55.89 *11 1.94381 0.487 12 ∞0.210 1.51633 64.14 13 ∞ 0.475 14 ∞ *ASPHERIC SURFACE

TABLE 4 EXAMPLE 2 - ASPHERIC SURFACE DATA SURFACE NUMBER KA A3 A4 A5 A62 −2.0039515E+01 −1.2448698E−02 7.4131070E−01  1.3826912E+00−1.8125809E+01 3 −4.8897250E+01 −1.9347683E−02 5.4364857E−02−1.4747156E−01 −1.3087475E+00 4 −1.7452825E+01  9.0521907E−03−1.2208731E−01   2.2103596E−01 −2.0152435E−01 5 −7.8912788E+01 8.0698728E−03 1.7863083E−01 −8.6425927E−01  1.4224441E+00 6−2.5345971E+01 −1.2360634E−02 1.0175729E−01 −3.3911850E−01−1.4961507E+00 7 −7.9754627E+00  1.1546075E−02 −2.2740935E−01  3.9212330E−01 −2.7949367E−01 9  1.7200090E+00  1.1499546E−011.4540766E−01 −1.9840783E−01  3.1074423E−02 10 −7.1726237E+00 2.0067864E−01 −3.2973802E−01  −2.7774645E−02 −4.1996892E−02 11−5.1208847E+00  2.0710261E−01 −8.7248133E−01   1.8613198E+00−2.6470699E+00 A7 A8 A9 A10 A11 2  6.5551634E+01 −1.0800103E+021.1376888E+00  2.9918328E+02 −3.7039456E+02 3  8.3008746E+00−2.1225272E+01 2.4993553E+01 −8.4626888E+00 −1.6051736E+01 4 6.6711523E−01 −1.9608556E+00 3.5268380E+00 −1.5450842E+01 4.0931703E+01 5  6.3812721E−01 −5.5116839E+00 2.2562122E+01−8.0236881E+01  1.5332472E+02 6  5.5966531E+00 −9.7871215E+001.2163429E+01 −1.2196211E+00 −2.9211549E+01 7 −1.3820084E+00 2.3913437E+00 −1.6749943E−01  −1.4696276E+00  4.2103324E−01 9−5.3756608E−01  1.0721672E+00 −9.3358327E−01   4.4997797E−01 3.1456221E−02 10  3.4992265E−01 −3.1692497E−01 6.5485345E−02 5.0507838E−02 −1.5554490E−02 11  2.1174141E+00 −6.3522025E−01−2.8993216E−01   2.6994844E−01 −1.9485096E−02 A12 A13 A14 A15 A16 2−2.8149346E+02  1.1920841E+03 −1.3054361E+03   6.1378726E+02−5.8753275E+01 3  4.3721569E+01 −5.6520875E+01 8.2734116E+00 5.6701008E+01 −5.3330946E+01 4 −3.8172820E+01  2.9291572E+00−1.0337946E+01   5.0441611E+01 −4.6331066E+01 5 −1.3008987E+02−1.5594096E+00 1.0469545E+02 −1.2108902E+02  9.1159400E+01 6 4.3086329E+01 −2.0944782E+01 −1.4768785E+00   1.8203550E+01−3.3134582E+01 7 −1.2379886E+00  3.5395833E+00 −2.4811704E+00 −6.4714970E−01  1.7652411E+00 9 −2.3488527E−01  9.3171451E−026.9846202E−02 −7.5640513E−02  2.7038981E−02 10 −1.4087348E−02 5.8843518E−03 2.1124494E−03 −1.6238487E−03  2.4772277E−04 11−4.7451741E−02  1.8535873E−02 −1.7561022E−03   3.0825139E−04−4.2136611E−04 A17 A18 2 −3.2413905E+01  7.4284207E−01 3  1.6251618E+01−1.4699924E+00 4  1.6668962E+01 −2.8939601E+00 5 −4.2523867E+01 7.9967841E+00 6  2.3591591E+01 −5.1984636E+00 7 −9.3053276E−01 1.7255670E−01 9 −4.1548637E−03  2.0433066E−04 10  2.5779287E−05−7.3782258E−06 11  1.3209905E−04 −1.2864463E−05 SURFACE NUMBER KA A3 A4A5 A6 8 −8.4817579E+00 6.7375019E−02 −3.7624481E−01 1.4007491E+00−1.9207437E+00 A7 A8 A9 A10 A11 8  2.1740966E−01 1.4803594E+00−1.2568763E+00 2.9862313E−01  2.6897743E−01 A12 A13 A14 A15 A16 8−3.3916977E−01 1.1285095E−01  1.4013896E−02 1.4738579E−02 −1.2746998E−02A17 A18 A19 A20 8 −2.1917064E−02 2.3440871E−02 −7.9989073E−039.3882633E−04

TABLE 5 EXAMPLE 3 f = 4.380, Bf = 0.984, TL = 5.015 Si Ri Di Ndj νdj1(APERTURE ∞ −0.182 STOP) *2 1.59047 0.759 1.53391 55.89 *3 21.476380.100 *4 −11.48602 0.349 1.63351 23.63 *5 10.86843 0.270 *6 −5.824150.450 153391 55.89 *7 −4.86954 0.461 *8 31.42057 0.412 1.63351 23.63 *9−31.42268 0.214 *10 8.24307 1.016 1.53391 55.89 *11 2.28130 0.487 12 ∞0.210 1.51633 64.14 13 ∞ 0.358 14 ∞ *ASPHERIC SURFACE

TABLE 6 EXAMPLE 3 - ASPHERIC SURFACE DATA SURFACE NUMBER KA A3 A4 A5 A62 −2.0031508E+01 −1.2819994E−02  −2.4596863E−01  1.3144942E+01−8.7392677E+01  3 −4.7463252E+01 −4.3178463E−02  −7.0019170E−01 9.2779024E+00 −5.5691110E+01  4 −1.2538348E+01 1.0142322E−02−1.7630802E+00  2.0382764E+01 −1.1816877E+02  5 −7.7876842E+013.5672873E−02 −1.1799006E+00  1.3219043E+01 −7.4241642E+01  6−2.4477757E+01 −1.3583828E−02   1.1832088E+00 −1.4509112E+017.9883800E+01 7 −8.3214910E+00 8.6799935E−02 −4.0495653E−01 2.4241364E−02 2.3543773E+00 8 −2.8870368E+00 9.4709547E−02−3.3061742E−01  7.6841698E−01 −3.8523185E−01  9  1.7200090E+006.4595789E−02  3.1021260E−01 −1.5207877E+00 3.7144350E+00 10−7.2839065E+00 1.4361791E−01 −1.5698926E−01 −4.4505111E−01 7.8623572E−0111 −5.0913761E+00 1.8824793E−01 −8.9452293E−01  2.1947851E+00−3.4876899E+00  A7 A8 A9 A10 A11 2  3.1176372E+02 −6.8822172E+02  9.6380495E+02 −8.3422246E+02 4.0754335E+02 3  1.9174098E+02−4.1353533E+02   5.6681156E+02 −4.7954895E+02 2.2856217E+02 4 4.0595433E+02 −8.7697447E+02   1.2038730E+03 −1.0192707E+034.8560953E+02 5  2.4832227E+02 −5.2052104E+02   6.9176133E+02−5.6626839E+02 2.6057459E+02 6 −2.6368454E+02 5.5158871E+02−7.3721521E+02  6.1044632E+02 −2.8550597E+02  7 −6.9413506E+008.7293266E+00 −3.8644406E+00 −1.8833066E+00 2.4661418E+00 8−2.5475758E+00 6.1108408E+00 −6.5131416E+00  3.8567313E+00−1.2539685E+00  9 −6.0132002E+00 6.1197418E+00 −3.7673235E+00 1.3334305E+00 −2.4232301E−01  10 −4.2824688E−01 −1.9359296E−01  4.0052658E−01 −2.2233502E−01 5.5291925E−02 11  3.4998335E+00−2.2327536E+00   9.0274887E−01 −2.2383608E−01 3.1023103E−02 A12 2−8.6048982E+01 3 −4.7038557E+01 4 −9.9698358E+01 5 −5.1582130E+01 6 5.7682158E+01 7 −6.7021395E−01 8  1.7665061E−01 9  1.6557652E−02 10−5.2740721E−03 11 −1.8387947E−03

TABLE 7 EXAMPLE 4 f = 4.320, Bf = 1.139, TL = 5.047 Si Ri Di Ndj νdj1(APERTURE ∞ −0.182 STOP) *2 1.54012 0.509 1.53377 55.74 *3 9.853570.138 *4 −19.03414 0.360 1.63512 21.04 *5 13.26625 0.329 *6 −4.311650.572 1.53369 56.30 *7 −3.51477 0.373 *8 −11.77589 0.412 1.63159 25.20*9 −10.72196 0.171 *10 4.65872 1.044 1.53399 55.66 *11 2.12264 0.487 12∞ 0.210 1.51633 64.14 13 ∞ 0.513 14 ∞ *ASPHERIC SURFACE

TABLE 8 EXAMPLE 4 - ASPHERIC SURFACE DATA SURFACE NUMBER KA A3 A4 A5 A62 −2.0027486E+01 −8.1971635E−03   9.9589137E−01 −1.6413245E+00 2.1161883E−01 3 −7.4917111E+01 −1.9235426E−02   2.9525293E−02−4.8748892E−01  1.3011517E+00 4 −2.5621598E+01 4.0397534E−02−2.3149677E−01 1.5679470E−01 −4.5071142E−01  5 −5.6981538E+018.2920249E−02 −2.0766492E−03 −2.2313474E−01  −3.6667937E+00  6−2.5732121E+01 3.5097379E−02 −1.8698387E−01 7.9083513E−02−1.6052274E+00  7 −8.0889368E+00 1.4235106E−02 −1.7930019E−013.2354002E−01 −5.4788828E−01  8 −4.4366227E+00 1.1249602E−01−3.5476590E−01 1.3152269E+00 −2.1624242E+00  9  1.7183703E+001.4141064E−01  8.9728855E−02 −5.4082261E−01  8.9221446E−01 10−7.1766091E+00 1.9582413E−01 −3.3359061E−01 −9.7208686E−02 1.3131036E−01 11 −5.1018294E+00 1.6210481E−01 −5.3385347E−018.4260681E−01 −9.8313526E−01  A7 A8 A9 A10 A11 2  3.4385443E+00−3.5707955E+00  −6.2471655E+00 1.5508929E+01 −9.0840213E+00  3−1.4977314E+00 4.1784464E+00 −1.4595191E+01 1.5051601E+01 3.7336060E+004  4.3395750E+00 −5.6340969E+00  −9.6082743E+00 1.7016891E+019.5699815E+00 5  1.9874892E+01 −3.6505454E+01   2.6884170E+01−1.0724199E+01  2.2106962E+01 6  1.0871323E+01 −3.7679244E+01  6.5749188E+01 −3.8995074E+01  −4.2878060E+01  7 −5.7677807E−011.8591642E+00 −8.3743763E−01 −5.3362661E−01  8.1881910E−02 8 9.0391677E−01 6.9455396E−01 −3.8166984E−01 −3.1341830E−01 6.1873781E−02 9 −1.2063991E+00 9.3095443E−01 −1.6303890E−01−1.8470823E−01  4.6466455E−02 10  1.6601252E−01 −2.1390073E−01  3.7986441E−02 6.1068196E−02 −4.0185458E−02  11  7.0348576E−01−2.4221981E−01   9.4600513E−03 4.5164365E−03 1.1207755E−02 A12 A13 A14A15 A16 2  5.8731708E−01 5.9103815E−01 −1.2581381E+01 2.1945587E+01−1.0089987E+01  3  1.6077792E+01 −9.1562495E+01   1.1760002E+02−5.9893436E+01  9.8749250E+00 4 −1.0785817E+01 −3.2152333E+01  3.2272681E+01 4.1603752E+00 −8.7406887E+00  5 −2.5784559E+019.8068345E+00 −1.7275062E+01 2.6855887E+01 −1.1296643E+01  6 8.0830308E+01 −5.1682424E+01   3.5673478E+01 −3.3138146E+01 1.2796842E+01 7  2.2666896E−02 6.9773393E−01 −5.9051712E−011.1373734E−01 9.2507327E−03 3  1.2363174E−01 7.7408870E−02−1.2655365E−01 3.6694357E−02 −6.8546148E−04  9  6.0081653E−02−3.6004295E−02   6.4175341E−03 1.2161810E−06 −8.2597455E−05  10 9.0185206E−03 −1.5123828E−03   9.3681368E−04 −3.2669992E−04 3.6699925E−05 11 −5.7617703E−03 1.7268935E−04  4.6859038E−04−1.1613779E−04  8.6645981E−06

TABLE 9 EXAMPLE 5 f = 4.413, Bf = 1.051, TL = 4.923 Si Ri Di Ndj νdj1(APERTURE ∞ −0.150 STOP) *2 1.57461 0.603 1.53410 55.80 *3 47.792410.188 *4 −7.12102 0.348 1.63370 24.10 *5 19.52526 0.343 *6 −6.423390.383 1.53372 55.82 *7 −8.05667 0.480 *8 25.81378 0.403 1.63164 21.50 *947.55690 0.157 *10 3.09120 0.967 1.53390 55.95 *11 1.73973 0.487 12 ∞0.145 1.51633 64.14 13 ∞ 0.469 14

TABLE 10 EXAMPLE 5 - ASPHERIC SURFACE DATA SURFACE NUMBER KA A3 A4 A5 A62 −2.0107696E+01 −2.2661782E−02  −5.4399900E−01  2.3217910E+01−1.8438211E+02  3 −4.4357390E+01 −2.5497459E−03  −1.9583400E−01 1.4073340E+00 −5.4400771E+00  4 −9.0798016E+00 1.0956079E−02−5.3381786E−02  4.9837678E−01 −2.2074690E+00  5 −6.9683630E+01−7.4427956E−03  −2.9622375E−03  9.9809263E−01 −4.2153635E+00  6−2.3338456E+01 1.4097596E−02 −2.4009851E−02 −1.0521517E+00 1.6716424E+007 −7.8920388E+00 1.3735682E−02  5.5837573E−01 −6.0827370E+002.4539937E+01 8 −8.3236335E+00 2.2299801E−03  1.4226945E+00−9.4489784E+00 3.3378436E+01 9  1.0000090E+00 −8.6603973E−03  1.1455767E+00 −4.5122894E+00 9.0734474E+00 10 −7.4372006E+004.6403018E−04  4.2832804E−01 −2.3674084E+00 4.2680533E+00 11−5.5796708E+00 6.4774038E−03  1.8274058E−01 −1.1766013E+00 2.3152449E+00A7 A8 A9 A10 A11 2  7.5279492E+02 −1.6572634E+03   1.4239324E+03 1.6368217E+03 −4.8119636E+03  3  3.0578468E+00 4.6535099E+01−1.7723702E+02  2.8157926E+02 −1.4995313E+02  4  6.1772685E+00−1.0198525E+01   8.5190124E+00 −2.4989492E+00 5.6335613E+00 5 6.4279893E+00 6.9983127E+00 −3.1478770E+01  8.8335446E+00 7.3148008E+016  9.2198343E+00 −4.9079113E+01   9.2056443E+01 −6.3240981E+01−1.4591993E+01  7 −5.6459991E+01 7.6904242E+01 −5.7529617E+01 9.6838070E+00 3.0016274E+01 8 −6.9274235E+01 8.4867452E+01−5.5326384E+01  6.6669423E+00 1.6593071E+01 9 −1.0331082E+015.7768697E+00 −1.6138063E−01 −1.5637188E+00 5.4745230E−01 10−4.1767785E+00 2.3361604E+00 −7.5848276E−01  3.1869381E−01−3.3107200E−01  11 −2.3303741E+00 1.0976932E+00  6.3266721E−02−3.3465302E−01 1.2662733E−01 A12 A13 A14 A15 A16 2  1.9492888E+035.9156569E+03 −9.4334918E+03  5.6780045E+03 −1.2922192E+03  3−1.7096360E+02 3.3733896E+02 −2.3138028E+02  7.6916678E+01−1.1947535E+01  4 −2.2539556E+01 4.0469790E+01 −4.7487679E+01 3.5627556E+01 −1.2004892E+01  5 −8.6353096E+01 −2.3435645E+01  9.8594183E+01 −6.0445865E+01 1.1081962E+01 6 −3.2390099E−019.5463391E+01 −1.0609281E+02  3.7057311E+01 −1.2057907E+00  7−4.5233308E+01 4.0168803E+01 −2.3662403E+01  8.1846925E+00−1.2333297E+00  8 −1.0343985E+01 −3.3639720E−03   2.2549613E+00−8.9330563E−01 1.1484978E−01 9  2.2413434E−01 −2.0658978E−01  5.3566530E−02 −4.3764378E−03 −1.3278690E−04  10  2.4702924E−01−1.0721095E−01   2.7567808E−02 −3.9621449E−03 2.4712851E−04 11 1.9333441E−02 −3.0221675E−02   1.0307763E−02 −1.6132445E−031.0023928E−04

TABLE 11 EXAMPLE 6 f = 4.439, Bf = 1.073, TL = 4.923 Si Ri Di Ndj νdj1(APERTURE ∞ −0.150 STOP) *2 1.58500 0.605 1.53410 55.80 *3 207.466900.188 *4 −7.22216 0.357 1.63370 24.10 *5 13.70011 0.325 *6 −6.524350.367 1.53372 55.82 *7 −7.26771 0.480 *8 39.46237 0.453 1.63164 21.50 *9−65.97414 0.161 *10 3.22391 0.914 1.53390 55.95 *11 1.64413 0.487 12 ∞0.145 1.51633 64.14 13 ∞ 0.490 14

EXAMPLE 6 - ASPHERIC SURFACE DATA SURFACE NUMBER KA A3 A4 A5 A6 2−1.9604024E+01 −2.7410492E−02  −5.5042233E−01  2.3211271E+01−1.8433927E+02  3 −4.4721653E+01 −7.8305041E−04  −1.9705229E−01 1.4241934E+00 −5.4647287E+00  4 −4.4786849E+00 9.2169775E−03−3.6438354E−02  4.8573753E−01 −2.2220869E+00  5  1.1874999E+01−3.8933689E−03  −4.5014117E−03  9.8878294E−01 −4.2118569E+00  6 2.4960353E+00 2.3895654E−02 −1.1822186E−02 −1.0530811E+00 1.6746807E+007  7.8919147E+00 2.5612849E−02  5.4516362E−01 −6.0652408E+002.4541609E+01 8 −8.0561296E+00 3.3411384E−03  1.4049366E+00−9.4367823E+00 3.3382451E+01 9  1.0000096E+00 −1.6466850E−02  1.1610633E+00 −4.5149064E+00 9.0738246E+00 10 −4.7876367E+00−1.7251991E−02   4.3909478E−01 −2.3697397E+00 4.2678462E+00 11−3.1795528E+00 −2.5540757E−02   1.8112566E−01 −1.1718884E+002.3154327E+00 A7 A8 A9 A10 A11 2  7.5278917E+02 −1.6572950E+03  1.4239078E+03  1.6368233E+03 −4.8119348E+03  3  3.0650226E+004.6534584E+01 −1.7722059E+02  2.8158305E+02 −1.4996673E+02  4 6.1717221E+00 −1.0182726E+01   8.5310651E+00 −2.5016451E+005.6297775E+00 5  6.4279781E+00 6.9975562E+00 −3.1491105E+01 8.8309805E+00 7.3140592E+01 6  9.2179979E+00 −4.9084879E+01  9.2066584E+01 −6.3237674E+01 −1.4583154E+01  7 −5.6460819E+017.6901421E+01 −5.7531093E+01  9.6852795E+00 3.0016752E+01 8−6.9275009E+01 8.4866217E+01 −5.5326366E+01  6.6670909E+00 1.6593138E+019 −1.0330993E+01 5.7768192E+00 −1.6141589E−01 −1.5637535E+005.4743138E−01 10 −4.1767348E+00 2.3361707E+00 −7.5847935E−01 3.1869462E−01 −3.3107160E−01  11 −2.3304941E+00 1.0976669E+00 6.3261420E−02 −3.3465382E−01 1.2662735E−01 A12 A13 A14 A15 A16 2 1.9493142E+03 5.9156555E+03 −9.4335012E+03  5.6779926E+03−1.2922165E+03  3 −1.7095144E+02 3.3731101E+02 −2.3140512E+02 7.6924136E+01 −1.1902385E+01  4 −2.2544253E+01 4.0438718E+01−4.7471782E+01  3.5639281E+01 −1.1993528E+01  5 −8.6342467E+01−2.3427266E+01   9.8606678E+01 −6.0442645E+01 1.1063294E+01 6−3.2250039E−01 9.5456363E+01 −1.0610765E+02  3.7068329E+01−1.2077524E+00  7 −4.5231523E+01 4.0170861E+01 −2.3661316E+01 8.1842458E+00 −1.2357787E+00  8 −1.0343947E+01 −3.3813030E−03  2.2549693E+00 −8.9331312E−01 1.1484796E−01 9  2.2412782E−01−2.0658849E−01   5.3568831E−02 −4.3753788E−03 −1.3294129E−04  10 2.4702921E−01 −1.0721097E−01   2.7567804E−02 −3.9621477E−032.4712672E−04 11  1.9333360E−02 −3.0221675E−02   1.0307768E−02−1.6132406E−03 1.0024024E−04

TABLE 13 EXAMPLE 7 f = 4.390, Bf = 1.067, TL = 4.856 Si Ri Di Ndj νdj *11.56927 0.612 1.53410 55.80 *2 62.77589 0.126 3(APERTURE ∞ 0.063 STOP)*4 −6.30119 0.354 1.63370 24.10 *5 31.24436 0.328 *6 −6.33840 0.3491.53372 55.82 *7 −7.46913 0.463 *8 −62.84123 0.380 1.63164 21.50 *9−29.03855 0.176 *10 2.99641 0.938 1.53390 55.95 *11 1.62519 0.487 12 ∞0.145 1.51633 64.14 13 ∞ 0.484 14 ∞ *ASPHERIC SURFACE

TABLE 14 EXAMPLE 7 - ASPHERIC SURFACE DATA SURFACE NUMBER KA A3 A4 A5 A61 −1.9498259E+01 0.0000000E+00 −1.2678403E−01  7.4463227E+00−2.4961395E+01  2  3.6086370E+00 0.0000000E+00 −2.7274111E−01 2.2441876E+00 −1.0662053E+01  4 −5.0253863E+00 0.0000000E+00 1.5158641E−01 −1.6580576E+00 9.6834090E+00 5  1.0740752E+010.0000000E+00 −1.2937718E−01  2.2130863E+00 −9.6919780E+00  6 2.7788659E+00 0.0000000E+00  9.1677765E−01 −9.6947664E+00 4.2266864E+017  6.9209073E+00 0.0000000E+00  1.4597058E+00 −1.1896778E+014.0075788E+01 8 −8.3649266E+00 0.0000000E+00  1.7195168E+00−9.2047912E+00 2.5189628E+01 9  9.6225742E−01 0.0000000E+00 1.1958066E+00 −3.5480021E+00 2.8447742E+00 10 −7.4372609E+000.0000000E+00  5.5822003E−01 −2.8952257E+00 5.3221412E+00 11−2.5143090E+00 0.0000000E+00 −1.3376055E−01 −4.6783336E−02 2.5148559E−01A7 A8 A9 A10 A11 1 −4.7840875E+01 5.4833738E+02 −1.5505225E+03 1.6629091E+03 7.6876452E+02 2  2.4106664E+01 −1.0102384E+01 −8.4860045E+01  2.5455188E+02 −4.5305500E+02  4 −1.9875368E+01−5.3708956E+01   3.8494739E+02 −7.4935411E+02 2.2561769E+02 5 1.6859111E+01 1.1622654E+01 −7.5229001E+01  1.3193842E+01 2.2456527E+026 −9.5097621E+01 7.7581678E+01  9.6831074E+01 −2.0965999E+02−8.5394699E+01  7 −6.2048443E+01 6.9035575E+00  1.1799100E+02−1.5103559E+02 5.2703168E+01 8 −3.7190405E+01 2.5025731E+01 4.8009978E−01 −6.5439415E+00 −4.9331564E+00  9  6.6003076E+00−1.9749997E+01   2.2323831E+01 −1.2567009E+01 2.9805026E+00 10−5.2991216E+00 2.8346627E+00 −5.9189414E−01  1.7428946E−02−2.0557568E−01  11 −2.3239759E−01 7.0762172E−02 −2.4029042E−03 3.3980208E−02 −4.1691366E−02  A12 A13 A14 A15 A16 1 −3.3843753E+031.7707007E+03  1.6269970E+03 −6.0197204E+02 −2.7643785E+03  2 6.7019959E+02 −6.4964530E+02  −9.6481880E+01  1.2277909E+03−1.5538838E+03  4  5.7142615E+02 2.1132168E+03 −7.8700807E+03 7.3789144E+03 1.4951146E+03 5 −6.9246658E+01 −8.5684519E+02  1.3114538E+03 −7.5231584E+01 −1.4016346E+03  6  4.7057506E+02−2.2678882E+02  −3.9177203E+02  4.7952635E+02 −8.8872307E+01  7−5.1746545E+01 1.9288276E+02 −1.9159410E+02  4.2534695E−01 1.1228879E+028  6.1266756E+00 3.2017468E+00 −5.7426214E+00  1.5294774E+008.4828869E−01 9  8.7228059E−02 −3.4439816E−01   6.4828115E−01−6.6768225E−01 3.2879472E−01 10  2.2559541E−01 −8.9556500E−02  9.5654337E−03  3.3868106E−03 −9.0019404E−04  11  1.4802969E−021.4547836E−03 −2.0984112E−03  2.5706385E−04 1.1960968E−04 A17 A18 1 2.8028209E+03 −8.1398936E+02  2  8.7454032E+02 −1.9478922E+02  4−6.2441064E+03 2.7849394E+03 5  1.2767488E+03 −3.6879271E+02  6−1.0613015E+02 4.5609491E+01 7 −7.0736402E+01 1.4217356E+01 8−5.5427310E−01 8.8823273E−02 9 −7.8924948E−02 7.5382746E−03 10−1.5910886E−05 1.5942007E−05 11 −3.8181629E−05 3.2282100E−06

TABLE 15 VALUES IN CONDITIONAL EXPRESSIONS EXPRESSION CONDITIONALEXAMPLE EXAMPLE EXAMPLE EXAMPLE EXAMPLE EXAMPLE EXAMPLE NUMBEREXPRESSIONS 1 2 3 4 5 6 7 1 f1/f3 0.002 0.06 0.07 0.12 −0.05 −0.02 −0.032 f/f2 −0.55 −0.31 −0.50 −0.35 −0.54 −0.60 −0.53 3 (R3f − R3r)/ −0.010.04 0.09 0.10 −0.11 −0.05 −0.08 (R3f + R3r) 4 f/f5 −0.55 −0.71 −0.70−0.51 −0.44 −0.56 −0.50 5 f · tan ω/R5r 2.08 1.80 1.54 1.68 2.03 2.032.22 6 f/f1 1.43 1.19 1.38 1.29 1.45 1.49 1.46 7 f/f3 0.003 0.07 0.090.15 −0.07 −0.03 −0.05 8 f/f34 0.10 0.43 0.27 0.18 −0.02 0.09 0.003 9D7/f 0.12 0.11 0.11 0.09 0.11 0.11 0.11

What is claimed is:
 1. An imaging lens consisting of, in order from anobject side, five lenses of: a first lens that has a positive refractivepower and has a meniscus shape which is convex toward the object side; asecond lens that has a biconcave shape; a third lens that has a meniscusshape which is convex toward an image side; a fourth lens that has apositive refractive power; and a fifth lens that has a negativerefractive power and has at least one inflection point on an image sidesurface, wherein the following conditional expression (1) is satisfied:−0.06<f1/f3<0.4  (1), where f1 is a focal length of the first lens, andf3 is a focal length of the third lens.
 2. The imaging lens, as definedin claim 1, wherein the following conditional expression is furthersatisfied:−0.65<f/f2<−0.2  (2), where f is a focal length of a whole system, andf2 is a focal length of the second lens.
 3. The imaging lens, as definedin claim 1, wherein the following conditional expression is furthersatisfied:−0.2<(R3f−R3r)/(R3f+R3r)<0.2  (3), where R3 f is a paraxial radius ofcurvature of an object side surface of the third lens, and R3 r is aparaxial radius of curvature of an image side surface of the third lens.4. The imaging lens, as defined in claim 1, wherein the followingconditional expression is further satisfied:−1<f/f5<−0.3  (4), where f is a focal length of a whole system, and f5is a focal length of the fifth lens.
 5. The imaging lens, as defined inclaim 1, wherein the following conditional expression is furthersatisfied:1<f·tan ω/R5r<10  (5), where f is a focal length of a whole system, ω isa half angle of view, and R5 r is a paraxial radius of curvature of animage side surface of the fifth lens.
 6. The imaging lens, as defined inclaim 1, wherein the following conditional expression is furthersatisfied:0.8<f/f1<1.6  (6), where f is a focal length of a whole system, and f1is the focal length of the first lens.
 7. The imaging lens, as definedin claim 1, wherein the following conditional expression is furthersatisfied:−0.3<f/f3<0.5  (7), where f is a focal length of a whole system, and f3is the focal length of the third lens.
 8. The imaging lens, as definedin claim 1, wherein the following conditional expression is furthersatisfied:0<f/f34<0.7  (8), where f is a focal length of a whole system, and f34is a composite focal length of the third lens and the fourth lens. 9.The imaging lens, as defined in claim 1, wherein the third lens has apositive refractive power.
 10. The imaging lens, as defined in claim 1,wherein the following conditional expression is further satisfied:0.05<D7/f<0.3  (9), where f is a focal length of a whole system, and D7is a spacing on an optical axis between the third lens and the fourthlens.
 11. The imaging lens, as defined in claim 1, further comprising anaperture stop that is disposed on the object side of an object sidesurface of the second lens.
 12. The imaging lens, as defined in claim 1,wherein the following conditional expression is further satisfied:−0.055<f1/f3<0.3  (1-1), where f1 is the focal length of the first lens,and f3 is the focal length of the third lens.
 13. The imaging lens, asdefined in claim 1, wherein the following conditional expression isfurther satisfied:−0.64<f/f2<−0.25  (2-1), where f is a focal length of a whole system,and f2 is a focal length of the second lens.
 14. The imaging lens, asdefined in claim 1, wherein the following conditional expression isfurther satisfied:−0.16<(R3f−R3r)/(R3f+R3r)<0.15  (3-1), where R3 f is a paraxial radiusof curvature of an object side surface of the third lens, and R3 r is aparaxial radius of curvature of an image side surface of the third lens.15. The imaging lens, as defined in claim 1, wherein the followingconditional expression is further satisfied:−0.8<f/f5<−0.35  (4-1), where f is a focal length of a whole system, andf5 is a focal length of the fifth lens.
 16. The imaging lens, as definedin claim 1, wherein the following conditional expression is furthersatisfied:1.3<f·tan ω/R5r<3  (5-1), where f is a focal length of a whole system, ωis a half angle of view, and R5 r is a paraxial radius of curvature ofan image side surface of the fifth lens.
 17. The imaging lens, asdefined in claim 1, wherein the following conditional expression isfurther satisfied:1<f/f1<1.5  (6-1), where f is a focal length of a whole system, and f1is the focal length of the first lens.
 18. The imaging lens, as definedin claim 1, wherein the following conditional expression is furthersatisfied:−0.1<f/f3<0.4  (7-1), where f is a focal length of a whole system, andf3 is the focal length of the third lens.
 19. The imaging lens, asdefined in claim 1, wherein the following conditional expression isfurther satisfied:0<f/f34<0.6  (8-1), where f is a focal length of a whole system, and f34is a composite focal length of the third lens and the fourth lens. 20.An imaging apparatus comprising: the imaging lens, as defined in claim1.